CN200952488Y

CN200952488Y - Single-stage horizontal automatic balancing centrifugal sealing pump

Info

Publication number: CN200952488Y
Application number: CN 200620090285
Authority: CN
Inventors: 丛铭; 姜凤维
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-05
Filing date: 2006-04-05
Publication date: 2007-09-26
Anticipated expiration: 2016-04-05

Abstract

A single-stage horizontal auto-balancing centrifugal seal pump in which a cylindrical bearing is set between the front and the rear ends of the bearing body which is arranged with a pump shaft, the pump shaft is at the stopping close zone leading to the middle rack of the pump and is equipped with a static and a dynamic seal retainers, the seal retainers are arranged with springs and V-shaped sealing rings, a spin detent is fixed outside the dynamic seal retainer. After installation of a on the pump shaft, the pump cover A is arranged on following installing a balancing auxiliary impeller and a balancing plate, and then the pump cover B is installed on, an auxiliary impeller and an annular seal are tightened by the impeller nuts after installation, the pump shell and the middle rack and the bearing body are tightened by studs and nuts, and then to install and arrange the balancing discharge inhalation pipeline device. The present utility model is easy to use, convenient and low-cost to prepare, long service life, without leakage, suitable to transport all kinds of high temperatures, strong corrosive chemical industry liquid medium containing crystalline particles.

Description

Single-stage horizontal automatic balance centrifugation seal pump

Technical field the utility model relates to a kind of single-stage horizontal automatic-balancing centrifugal seal pump device.

The background technique pump with mechanical seal is not suitable for carrying some chemical liquid medium, and because of in the running, saturated solution is in the sealing surface crystallization gasification that scabs, generates heat, form dry friction, perhaps inlet pressure changes, and moment causes mechanical seal to damage, not only cause device damage, and leak seriously befouling environment, consume big, the maintenance expenses height, Utilization ratio is low, and labor intensity is big, efficient is low, and cost is high.Various countries chemical machinery field scientific and technical personnel, scientific research institution, conveying at above-mentioned chemical liquid medium, go through the development test of decades, centrifugal sealing pump arises at the historic moment, utilize the centrifugal seal principle, form during running and have only the fluid centrifugal seal, and do not have the machinery friction, the working life of greatly having improved Sealing.But centrifugal sealing pump still exists three key issues not break through in a very long time, has only 1/2 of front shroud as impeller pressure, lift is high more, pressure is big more, and axial force is big more, makes this pump can only be used in the slow-speed of revolution, low lift, does not have the operating mode of inlet pressure; The sealing surface crystallization of back-pressure district scabs; Inlet pressure is big, and axial force is just big, and bearing is fragile, and makes the application study of this pump not have rapid progress in decades.

Pass through application study, the test of more than ten years again, progressively solved above-mentioned two key issues in recent years.The single-stage horizontal Power sealing pump has been invented the design method that does not produce axial force, tentatively solves axial force of impeller, and this pump begins to be used at a high speed, high-lift operating mode; The single-stage horizontal centrifugal sealing pump has been invented neutral centrifugal sealing method, and the crystallization that this pump the has solved the back-pressure district well problem that scabs enlarged application area, but inlet pressure is still little.

Because a variety of causes, liquid medium can the generation crystallization granular occur in the Chemical Manufacture in pump line is carried, because mechanical seal or packing seal are to realize sealing by friction, and crystallization or granular that the chemical liquid medium is produced, can cause damage to pump for Mechanical Sealed Type or packing seal formula, for this reason mechanical seal and packing seal and inapplicable meeting cause poorly sealed, seepage can produce waste and pollution, amount of maintenance is big, cost of production is high.

The summary of the invention the purpose of this utility model provide a kind of simple to operate, easy to maintenance, maintenance expenses is few, long service life, sealing without leakage, be adapted to carry the flow process single-stage horizontal automatic balance centrifugation seal pump that contains the crystalline particle chemical medium of various high temperature, severe corrosive, mainly include bearing housing, pump shaft, the centrifugal minor parking of spring locking device, sub-propeller, A pump cover, Balance disc sub-propeller, balance plate, B pump cover, impeller, impeller nut, pump case, balance pressure release suction line and form; Its garden axis of a cylinder holds and is embedded in position, rear and front end in the bearing housing, pump shaft is installed in the bearing housing, pump shaft is position, parking confined area in leading to the pump intermediate support, be provided with quiet, the motive sealing seat, be provided with in the motive sealing seat spring is installed, the V-seal ring, the motive sealing seat is outside equipped with centrifugal son, after installing sub-propeller, the pump shaft upper sleeve through installs the A pump cover, then the Balance disc sub-propeller is installed at the axle upper sleeve through, balance plate, install the B pump cover, install impeller, tight behind the choma with impeller nut rotation edge, pump case is tightened with rotary connection of stud nut with intermediate support and bearing housing, install and prepare balance pressure release suction line device.

The working principle of centrifugal pump: impeller is installed in the pump case, and be fastened on the pump shaft, pump shaft is directly driven by motor, pump case central authorities have the pressure releasing chamber C place to be communicated with pump intake by balance pressure release suction line, and C place liquid medium is arranged to inlet through the liquid medium that balance pressure release suction line enters on the pump case; Before pump startup, fill the liquid medium that is transferred in the pump case, start the back impeller and drive high speed rotating by axle, interlobate liquid medium also must be along with rotation, under action of centrifugal force, liquid medium is thrown to outer rim from the impeller center and the common bluebeard gets energy, enter in the volute pump case to leave impeller outer edge at a high speed, centrifugal pump relies on rotary blade that the effect of liquid medium is passed to liquid medium to the mechanical energy of prime mover, because the effect liquid medium of centrifugal pump flows to the process of outlet from impeller inlet, the discharge of liquid medium and form vacuum or low pressure, liquid medium in the priming reservoir is under the effect of liquid level pressure (barometric pressure), be pressed into the import of impeller, so the impeller that is rotating just constantly sucks and the drain medium continuously.

The automatically balancing axial force principle: the choma diameter equates that with top to the vertical area of impeller outer diameter front and rear cover plate pressure is identical, pressure balance.The choma diameter to the impeller diameter of axle, forms two balance cylinders of A, B with the bottom before and after balance plate.The Balance disc diameter is greater than the choma diameter, and then A chamber total pressure produces thrust in Balance disc greater than B chamber total pressure, B chamber high-pressure liquid medium enters the A chamber by throttle clearance b, push Balance disc open an axial clearance a, the A chamber is communicated with pressure release with pressure releasing chamber C, until A, B two Room total pressure balances.Pressure releasing chamber C liquid is communicated with pump intake by being equilibrated at pressure relief pipe.

The centrifugal seal principle: sub-propeller back side back blades produces the centrifugal seal back pressure, with the inlet pressure balance, reaches sealing effect.

Automatic-balancing centrifugal seal principle: Balance disc and sub-propeller are united two into one, be combined as a whole dexterously, promptly simplify the structure, reached triple purposes again: can automatically balancing axial force, the centrifugal seal inlet pressure is improved enlarge using scope.

The close principle of the envelope of stopping: utilize centrifugal action when the pump starting operation, centrifugal son produces centrifugal thrust under the effect of power, the motive sealing seat is pushed away a gap, make the static seal circle be in " nothing connects and a melts " state, during parking along with the disappearance of centrifugal force centrifugal sub-return, the motive sealing seat is withdrawn into it static seal circle and realizes seal action under the effect of spring.

The utility model advantage is: single-stage horizontal automatic balance centrifugation seal pump fully can the conveying mechanism canned pump or the chemical liquid medium that can not carry of stuffing sealed pump, because when single-stage horizontal automatic balance centrifugation seal pump runs well, centrifugal seal axial force that produces and the complete autobalance of axial force that the inlet positive pressure produces are realized sealing function; Be a kind of simple to operate, easy to maintenance, maintenance expenses is few, long service life, sealing without leakage, be adapted to carry various high temperature, severe corrosive contain crystalline particle chemical liquid medium.

The utility model is applicable to the high temperature of industries such as petrochemical industry, food sanitation, papermaking metallurgy, basic chemical industry, chemical fertilizer industry, pharmaceuticals industry, shipbuilding industry, the conveying use that contains crystalline particle chemical liquid medium of severe corrosive.

Description of drawings

Fig. 1 is a three-dimensional section simplified schematic diagram of the present utility model

Embodiment is shown in Figure 1 a kind of simple to operate; easy to maintenance; maintenance expenses is few; long service life; sealing without leakage; be adapted to carry various high temperature; in the three-dimensional section simplified schematic diagram of the flow process single-stage horizontal automatic balance centrifugation seal pump that contains the crystalline particle chemical medium of severe corrosive; its garden axis of a cylinder holds 1 and is embedded in position, rear and front end in the bearing housing 2; pump shaft 3 is installed in the bearing housing; pump shaft is position, parking confined area in leading to pump intermediate support 4; be provided with quiet; motive sealing seat 5; be provided with in the motive sealing seat spring 6 is installed; V-seal ring 7; the motive sealing seat is outside equipped with centrifugal sub 8; after installing sub-propeller 9, the pump shaft upper sleeve through installs A pump cover 10; then Balance disc sub-propeller 11 is installed at the axle upper sleeve through; balance plate 12; install B pump cover 13; install impeller 14; choma 15 backs are tight with impeller nut 16 rotation edges; pump case 17 is tightened with 18 rotary connections of stud nut with intermediate support and bearing housing, installed and prepare balance pressure release suction line 19 devices.

Claims

1; a kind of simple to operate; easy to maintenance; maintenance expenses is few; long service life; sealing without leakage; be adapted to carry various high temperature; the flow process single-stage horizontal automatic balance centrifugation seal pump that contains the crystalline particle chemical medium of severe corrosive; its garden axis of a cylinder holds and is embedded in position, rear and front end in the bearing housing; pump shaft is installed in the bearing housing; pump shaft is position, parking confined area in leading to the pump intermediate support; be provided with quiet; the motive sealing seat; be provided with in the motive sealing seat spring is installed; the V-seal ring; the motive sealing seat is outside equipped with centrifugal son; after installing sub-propeller, the pump shaft upper sleeve through installs the A pump cover; then the Balance disc sub-propeller is installed at the axle upper sleeve through; balance plate; install the B pump cover; install impeller; tight behind the choma with impeller nut rotation edge; pump case is tightened with rotary connection of stud nut with intermediate support and bearing housing, installed and prepare balance pressure release suction line device.